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Measuring canopy loss and climatic thresholds from an extreme drought along a fivefold precipitation gradient across Texas

hal.structure.identifierNicholas School of the Environment
dc.contributor.authorSCHWANTES, Amanda M.
hal.structure.identifierNicholas School of the Environment
dc.contributor.authorSWENSON, Jennifer J.
hal.structure.identifierNicholas School of the Environment
hal.structure.identifierConservation International
dc.contributor.authorGONZÁLEZ-ROGLICH, Mariano
hal.structure.identifierDepartment of Forest, Rangeland and Fire Sciences
hal.structure.identifierNicholas School of the Environment
dc.contributor.authorJOHNSON, Daniel M.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierNicholas School of the Environment
dc.contributor.authorDOMEC, Jean-Christophe
hal.structure.identifierNicholas School of the Environment
hal.structure.identifierStanford University
dc.contributor.authorJACKSON, Robert B
dc.date.accessioned2024-04-08T12:04:51Z
dc.date.available2024-04-08T12:04:51Z
dc.date.issued2017
dc.identifier.issn1354-1013
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196326
dc.description.abstractEnGlobally, trees are increasingly dying from extreme drought, a trend that is expected to increase with climate change. Loss of trees has significant ecological, biophysical, and biogeochemical consequences. In 2011, a record drought caused widespread tree mortality in Texas. Using remotely sensed imagery, we quantified canopy loss during and after the drought across the state at 30-m spatial resolution, from the eastern pine/hardwood forests to the western shrublands, a region that includes the boundaries of many species ranges. Canopy loss observations in ~200 multitemporal fine-scale orthophotos (1-m) were used to train coarser Landsat imagery (30-m) to create 30-m binary statewide canopy loss maps. We found that canopy loss occurred across all major ecoregions of Texas, with an average loss of 9.5%. The drought had the highest impact in post oak woodlands, pinyon-juniper shrublands and Ashe juniper woodlands. Focusing on a 100-km by ~1,000-km transect spanning the State's fivefold east-west precipitation gradient (~1,500 to ~300 mm), we compared spatially explicit 2011 climatic anomalies to our canopy loss maps. Much of the canopy loss occurred in areas that passed specific climatic thresholds: warm season anomalies in mean temperature (+1.6°C) and vapor pressure deficit (VPD, +0.66 kPa), annual percent deviation in precipitation (-38%), and 2011 difference between precipitation and potential evapotranspiration (-1,206 mm). Although similarly low precipitation occurred during the landmark 1950s drought, the VPD and temperature anomalies observed in 2011 were even greater. Furthermore, future climate data under the representative concentration pathway 8.5 trajectory project that average values will surpass the 2011 VPD anomaly during the 2070-2099 period and the temperature anomaly during the 2040-2099 period. Identifying vulnerable ecological systems to drought stress and climate thresholds associated with canopy loss will aid in predicting how forests will respond to a changing climate and how ecological landscapes will change in the near term.
dc.language.isoen
dc.publisherWiley
dc.subject.enchange detection
dc.subject.enclimate change
dc.subject.endisturbance
dc.subject.enextreme event
dc.subject.enforest die-off
dc.subject.enrandom forests
dc.subject.entree mortality
dc.subject.envapor pressure deficit
dc.title.enMeasuring canopy loss and climatic thresholds from an extreme drought along a fivefold precipitation gradient across Texas
dc.typeArticle de revue
dc.identifier.doi10.1111/gcb.13775
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.journalGlobal Change Biology
bordeaux.page5120-5135
bordeaux.volume23
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue12
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02625194
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02625194v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Global%20Change%20Biology&rft.date=2017&rft.volume=23&rft.issue=12&rft.spage=5120-5135&rft.epage=5120-5135&rft.eissn=1354-1013&rft.issn=1354-1013&rft.au=SCHWANTES,%20Amanda%20M.&SWENSON,%20Jennifer%20J.&GONZ%C3%81LEZ-ROGLICH,%20Mariano&JOHNSON,%20Daniel%20M.&DOMEC,%20Jean-Christophe&rft.genre=article


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